package com.jy.rhin.infra.sign;

import com.jy.rhin.domain.document.filter.ContentEncoder;
import com.jy.rhin.domain.exception.RhinInfraErrorType;
import com.jy.rhin.infra.exception.RhinInfraException;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Objects;

/**
 * @author dhl
 * @date 2022/6/7
 * @Description
 */
public class ContentEncoder4Sha1 implements ContentEncoder {


    @Override
    public String sign(byte[] bytes) {
        if (Objects.isNull(bytes) || bytes.length == 0) {
            return null;
        }

        char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
            mdTemp.update(bytes);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char[] buf = new char[j * 2];
            int k = 0;
            for (byte byte0 : md) {
                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
                buf[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(buf);
        } catch (NoSuchAlgorithmException e) {
            throw new RhinInfraException(RhinInfraErrorType.TEXT_SIGN_ERROR, e);
        }
    }

}
